Deliberate mistake: Twice in this film Axel is shot at by multiple gunmen using automatic weapons at close range - and they all miss. In the Earthquake theme ride the bullets ricochet of the rails at Axel's feet. Why are they all aiming low? Why don't they raise their aim? In the park outside he hides behind a perfectly ordinary park bench and the bullets hit the wooden slats. Not one goes through the open spaces between them? I know bad guys can't shoot straight in the movies, but this is ridiculous ...
Deliberate mistake: When Axel is trying to rescue the kids on the Spider ride he simply pushes open the cage door. There is no way that the door could be opened so easily. Amusement park rides have safety latches on the doors to prevent people from falling out. (00:29:10)
Answer: Just before Uncle Dave is shot earlier in the film Axel figures out that the note he was given was written on treasury mint sample paper - I believe it's at this point that Axel know Fulbright was in on it since the "matter of life and death" note was written some time before the treasury mint paper truck heist.